Problem with IE and builder-comments

I haven't pinpointed the issue to a particular version of IE8, but I think this is only effecting IE people. Firefox always fine. When adding a comment to a page, the comment window is basically hidden.

I've tried the default theme builder layout to see if that would lead me somewhere, but its broken there too. Its OK in other non-theme builder themes.

I am using confluence 3.0.1 and the theme builder is 3.3.5-conf210.

Any help would be appreciated!